MIPS: Move timer code to arch/mips/cpu/$(CPU)/

Current timer routines (arch/mips/lib/timer.c) are implemented assuming
that MIPS32 coprocessor (CP0) resources, Counter and Compare registers
in this case, are available.  But this doesn't always work.

We need to make sure that all MIPS-based systems don't necessarily use
CP0 counter/compare registers as time keeping resources.  And some MIPS
variant processors might come with different hardware specs with genuine
MIPS32 CP0 registers.

With this change, each $(CPU)/ directory can have its own timer code.

Signed-off-by: Shinya Kuribayashi <skuribay@pobox.com>
diff --git a/arch/mips/cpu/mips32/Makefile b/arch/mips/cpu/mips32/Makefile
index e315c1b..eb8e005 100644
--- a/arch/mips/cpu/mips32/Makefile
+++ b/arch/mips/cpu/mips32/Makefile
@@ -27,7 +27,7 @@
 
 START	= start.o
 SOBJS-y	= cache.o
-COBJS-y	= cpu.o interrupts.o
+COBJS-y	= cpu.o interrupts.o time.o
 
 SRCS	:= $(START:.o=.S) $(SOBJS-y:.o=.S) $(COBJS-y:.o=.c)
 OBJS	:= $(addprefix $(obj),$(SOBJS-y) $(COBJS-y))